Playing as a support can be a pain in the ass and I've never received quite as much bullshit from my team when playing in any other role.
Here's a little story about stupid teammates and why support is a bad role to suggest for new players who want to play without getting yelled at (yes, bad carries can hurt a team more):
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Let's see, I had an Axe, Bane, Silencer, and Skeleton King on my team and I was Dazzle. First thing I did as soon as I entered the game was buy wards and courier like any good support should. Well, as I was placing the wards, the Axe and Silencer pair up as does the Bane and SK, leaving me in the middle to fight against Drow. Alright, no big deal, figured they could probably get some early kills and I knew I could handle the solo lane. Well, this being a pub game, my team obviously dies a couple times during the laning phase while I am still keeping Drow at bay with some Poison harass forcing her to waste money on heals. I also rack up a nice number of denies with 15 in just the first part of the game.
I watch Drow head towards top (which can be clearly seen on the map with the wards I still had up) and call SS Top. Well, as she is about halfway there, my wards go out and Silencer decides he'll just go ahead and keep at whatever it is that he is doing. He gets ganked and immediately says in the chat, "No call and no wards? Useless fucking support. Not only that, you fed Drow to hell and back."
This confused the hell out of me because not only had I not died a single time, I had also kept her money going towards regen and got crazy denies. I wonder what stat he was looking at. I'll admit, the wards did just go out, but I did have the call and a glance at the map before the wards disappeared would have revealed all. Not only that, as soon as the wards went out, I bought another set and had them on their way to me in the courier (which I had already upgraded). Of course, that elicited a 'chicken stealer' message from the SK even though it was not being used when I called it.
So the game continues on for a while without incident until I decide to go down to help the Bane and SK who were getting their asses kicked. SK has to use his revive and still ends up on the verge of death, so I use my Shallow Grave on him so that he can escape. After doing that, I go and help out Bane who is now getting 2v1'd. He uses his brain sap and still loses a shitton of health after that, My grave still hasn't cooled down, so I throw a poison at one of the attackers and then stand next to Bane and pull out a heal, which does enough damage to the attackers to get a double kill (they were already at low health). Bane, who would have died had I not used the heal, proceeds to call me a killstealing bitch. Whatever.
The game continues on and I ensure two double tower pushes down top and bottom using my support spells. Well, after that, we decide that we are never going to push again and end up losing.
Who's fault do you think that was? Yep, Dazzle's fault. 'such a noob support' 'didn't do shit the whole game' 'no heals, graves, or armor reduction all game long'
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The moral of the story? Only play support if you feel like getting yelled at even when you are playing extremely well.